Bosch 0445110078 Diesel Injector

On the 2.4L D5 platform, a failing Bosch 0445110078 injector typically presents as: hard starting when warm; uneven idle across the five cylinders; loss of power with rail-pressure faults; excess smoke on hard acceleration; diesel knock from one cylinder.

When two or more of these appear together, suspect the injector before peripheral systems — a comparative leak-off test and live-data cylinder-balance review will isolate the failed unit without tear-down.

The documented failure modes on this platform are: injector back-leak beyond specification on high-mileage engines; nozzle wear causing over-fuelling on individual cylinders; injector seat sealing failure causing compression leakage (black tar around injector).

Internal wear cannot be repaired in situ — once delivery drifts outside calibration, remanufacture or replacement is the reliable fix.

Five-cylinder layout — compare leak-off volumes across all five injectors, not just the suspect one. Clean around the injector seats before removal to stop debris entering the bores. Check for carbonised sealing washers ('black death') and clean seats fully before refitting.

Never condemn a common-rail injector on a fault code alone — codes identify the circuit or cylinder, while leak-off volumes and correction values identify the component.

Each remanufactured 0445110078 is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is then calibrated on a common-rail test bench against the manufacturer's specification sheet — delivery, back-leak and response are all verified before the injector is sealed and despatched with its calibration data on file.

Every unit carries a 12-month parts warranty and free UK delivery.

The 0445110078 trusted family covers 5 verified vehicle fitments across 1 make: Volvo. Every fitment listed on this page is registry-verified — no scraped or assumed applications.

0445110078 supersedes or cross-references 18 further OE numbers, including 0445110077, 0986435120, 30756063, 30777314, 31303259, 36051165, 8602669 and 8602699. Always match the reference etched on your failed unit's body — cross-references within a family are verified equivalents, but etched numbers remain the source of truth.